Clamp.



M. S. ROBINSON.

GLAMP.-

APPLICATION FILED JUNE 23, 1911.

1 010 075 1 Patented Nov. 28, 1911.

INVENTOR.

' A fro/211E135.

- T FFTQE.

CLAMP.

To all whom it may concern:

Be it known that I, MILLARD S. ROBINSON, a citizen of the United States of America, residing at Donora, in the county of Washington and State of Pennsylvania, have invented certain new and useful Improvements in Clamps, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to clamps especially designed for gripping and holding electrical conductors, conduits, rods, pipes and cables used in the electric equipment of railways and buildings.

The primary object of my invention is to provide a two-part clamp that can be easily and quickly placed in position to firmly hold the conductor, without marring or injuring the same.

A further object of the invention is to provide a sectional or two-part clamp with a novel clamping member which causes the sections of the clamp to become more firmly bound upon the conductor as the weight of the conductor increases.

I attain the above objects by a mechanical construction that will be hereinafter spe cifically described and then claimed, and reference will now be had to the drawing, wherein Figure 1 is a side elevation of the clamp,

applied to a conductor. Fig. 2 is an enlarged perspective view of the sections or jaws of the clamp, showing the same separated to better illustrate the construction, Fig. 3 is a cross sectional view of the clamp showing same applied in position on a con ductor, and Fig. 4 is a detached enlarged perspective View of the clamping member.

The reference numerals 1 and 2 respectively denote semi-cylindrical jaws having the inner faces thereof provided with circumferentially arranged short ribs or beads 3 and 4, the ribs 3 being arranged in parallelism and staggered with relation to the ribs 4, with the ribs 3 curving toward one end of each jaw and the ribs 4 toward the opposite end. These ribs are adapted to frictionally engage the surface of a conductor 5, without injuring the same, the ribs preventing the aws from shifting upon the conductor after being clamped in engage- Specification of Letters Patent.

' Application filed June 23, 1911.

Patented Nov.

Serial No. 634,944.

. j L a ment therewith. The jaw 2 near the forward end thereof is provided with oppositely disposed extensions 6 arranged at right angles to said jaw and having the outer ends thereof provided with vertical faces 7. Pins 8 project outwardly from said faces. The jaw 1 adjacent to the rear end thereof is provided with a transverse enlargement 9, corresponding in length to the combined length of the extensions 6. The ends of the enlargement 9 terminate in vertical faces 10 and said enlargement is provided with a longitudinal opening 11. Mounted in the opening 11 is a pivot pin 12 for the side arms 13 of a clamping member 14. The side arms are provided with openings 15 to receive the ends of the pin 12 and the outer ends of the arms are hook-shaped, as at 16 to engage over the pins 8. The member 14 is recessed, as at 17 to provide clearance for the end of the jaw 1, which is of a greater length than the jaw 2. The member 14 has the rear end thereof enlarged and apertured, as at 18 and pivotally connected to said member by a bolt 19 and a nut 20 is an insulator 21 of the ordinary and well known type. The opposite end of this insulator is pivotally connected to an eye bolt 22 or to any other suitable support, as a cable or hanger. The pin 12 serves as a fulcrum for the member 14 and the greater the pressure brought to bear upon the jaw 1, the greater the pressure brought to bear upon the conductor 5 by the jaw 2, consequently the conductor will be firmly clamped between the jaws and positively held.

While in the drawing there is illustrated a preferred embodiment of the invention, it is to be understood that the structural elements thereof are susceptible to such changes as fall within the scope of the appended claim.

What I claim is A clamp comprising a pair of cylindrical independent clamping jaws each provided on its inner face with two sets of circumferentially extending ribs the ribs of each set arranged in parallelism and staggered with respect to the ribs of the other set, the ribs of one set curving toward one side of the jaw and the ribs of the other set curving against the opposite end of the jaw, said jaws being superposed with respect to each other, one of said jaws formed with a pair of laterally extending pins and the other of said jaws having a transversely extending opening, a clamping member having a pair opening for pivotally connecting the clamping member to that jaw having the opening. 10 In testimony whereof I afiix my signature in the presence of two witnesses.

MILLARD S. ROBINSON.

of hook-shaped arms engaging with said Witnesses: pins for maintaining the Jaws 1n superposed A. B. BARTHOLOMEW, relation, and means extending through said J. C. 1300mm.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

